millēsĭmus (-lensimus), a, um, adj. [mille],
the thousandth (class.): millesimam partem vix intellego, Cic. Att. 2, 4, 1; cf.: in millesimo corpore, Cels. 2, 6: inter mille rates tua sit millesima puppis, i. e. ultima, Ov. H. 13, 97: usura, one for every thousand monthly , Sen. Ira, 3, 33: pagina, Juv. 7, 100. —In plur.: armillam, ex millesimis Mercurii factam, the thousandth part of gain vowed to Mercury , Petr. 67, 7.—Hence, adv.: millēsĭmum , for the thousandth time : Q pater quartum vel potius millesi mum nihii sapit, Cic. Att. 12, 5, 1.